package com.leo.client;

import io.netty.buffer.ByteBuf;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInboundHandlerAdapter;

import java.nio.charset.StandardCharsets;
import java.util.Date;

/**
 * @ClassName FirstClientHandler
 * @Description
 * @Author wangss
 * @date 2022.03.21 20:16
 * @Version 1.0
 */
public class FirstClientHandler extends ChannelInboundHandlerAdapter {
    @Override
    public void channelActive(ChannelHandlerContext ctx) throws Exception {
        System.out.println(new Date() + " 客户端写出数据");

        // 1.获取数据
        ByteBuf byteBuf = getByteBuf(ctx);

        // 2.写数据
        ctx.channel().writeAndFlush(byteBuf);
    }

    @Override
    public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
        ByteBuf byteBuf = (ByteBuf) msg;

        System.out.println(new Date() + ": 客户端读到数据 -> " + byteBuf.toString(StandardCharsets.UTF_8));
    }

    private ByteBuf getByteBuf(ChannelHandlerContext ctx) {
        // 1.获取二进制抽象 byteBuf
        ByteBuf buffer = ctx.alloc().buffer();

        // 2.准备数据，指定字符串的字符集为utf-8
        byte[] bytes = "你好，我是来自未来的我".getBytes(StandardCharsets.UTF_8);

        // 3.填充数据到byteBuf
        buffer.writeBytes(bytes);

        return buffer;
    }
}
